show loading bar on postbacks in safari

[AmarieEA]

I want to show the loading bar on postbacks.

In my loading-bar.js I add:

window.onbeforeunload = function () {
                  if (window.beforeUnloadHandler) {
                      var result = window.beforeUnloadHandler();
                      if (!(result === undefined))
                          return result;
                  }

                  cfpLoadingBar.start();
};

It is works perfectly in chrome but don't work in safari. Also I noticed that if I set breakpoint after cfpLoadingBar.start(); the loadind bar is showed.

angular-loading-bar v0.9.0